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3-15y²+(4-6y²)
3-15y2 +4+6y²
7-9y²
5(3x²-4) -( 2(3x²-7))
15x²-20-(6x²-14)
15x²-20-6x²+14
9x²-6
6x²-14 - 15x² + 20
6x²-15x² -14 +20
-9x² + 6
sorry yh kalau salah